It matters only if steklomoy is the original author. If you can prove that with timestamps etc - that's great. So far all evidence shows otherwise.

This is not a court of law. No one is going to prison. User was shown to have copied text from somewhere else and passed it as their own => ban. It's been that way for years here and you're not the first one attempting to bend the rules. That's not a winning strategy. You should focus on whether steklomoy's positive contributions to the forum are sufficient for him to get leniency in this case, instead of continuing to argue that copypasta is ok. It's not.